Molding-machine for plastic material.



C. BARBIERI. MoLmNG Acme ron PLASTIC MATERIAL.

APPLICAUON FILED NOV.2.191`E. 1,238,980. Pmmdsepn 4,1917.

B SHEETS-SHEET 1.

iff/m Z C. BARBIERI. MOLDING MACHINE FOR PLASTIC MATERIAL. APPucmon FILED Nov. 2. 1916.

1,238,980. Patentedsepn. 4,1917.

8 SHEETS-SHED' 2.

C. BARBIERI. MOLDING MACHINE FOR PLASTIC MATERIAL. Armcmou FILED Nov. 2, |916.

1,238,980. Patented sept. 4,1917.

/ S5 ffv?? for C. BARBIERI. MOLDING MACHINE FOR PLASTIC MATERIAL.

APPLICATION FILED IIOV. 2. ISIS. 1,238,980. Patented sept. 4,1917.

8 SMEETS-SHEET 4.

C. BARBIERI. MULDING MACHINE FOR PLASTIC MATERIAL.

APPLlCATlON FILED NOV. 2 |916. 1,238,980. Patentedsept. 4,1917.

8 SHEETS-SHEET 5.

C. BARBIERI.

MOLDING MACHINE FOR PLASTIC MATERIAL.

' APPLICATION FILED NOV. 2. 1916. 1,238,980. Pmndsept. 4,1917.

8 SHEETS-SHEEI 6.

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C. BARBIERI.

MOLDING MACHNE FGR PLASTIC MATERIAL.

APPLlcATIoN min Nov. 2. |916.

1,238,980. Pandspt. 4,1917.

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MULDING MACHINE FOR PLASTIC MATERIAL.

APPLIc/mou man nov. 2. Isls.

1,238,980. Patentedsept. 4,1917.

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'To all whom it may concern:

-a subject of the 'enanas onmcn.

cnsa'n'n "zintuigen-emesso, rnmiror l l l i l :,nronafrxo'n or rumors LLINoIs, 'A utoronto-'MACHINE ronrnnsnc Marsman,

1,238,980.' specimens at. Lean-raient "Patentea'spt, 4,1911 Appllctibn Med Iovember'; 1918. BerialNo.1!l9,098.

.- Fi-g.' is a fragmentary'plan viewof one Be it known that I, CESARE BARBIERI, of thedie-holders.

King of Italy, and a resif Fig. 6 is a d tail of 'a guide roller bracket county of Cook, and State :secured to the die holder.

Fig. 7 is a plan view of a die holder.

Fig. 8 is a fragmentary sectional view of a die holder.

LFig. 9'is a detail of a gear and cam integral therewith, and a cross head which Vis reciprocated by said cam and serves to operate the loading device.

rient of Chicago, of Illinoisfhave invented certain new and useful Improvements in MoldingMachines for Plastic Material, of which' thefollowing is a specification.

This invention relates to machines for forming articles from lastc material and the embodimentthereof) shown inthe rawing is'designed with reference to the pro duction of disk-shaped targets of fragile material such as coal tars mixed with crushed limestone.

The obiects of the invention are'to provide various improved mechanisms for measuring, feeding and forming into the desired`shapes plastic material; to provide a rotary type of machine with 'improved means for maintaining the dies in horizontal position 4 during the feeding and forming operations 'ger dies.

Fig. 11 is a sectional view of a plunger die taken on the line A--A of'Fi 10.

Fig'. 11A is a sectional detail o a plunger die taken on the line B-B of Fig. 10.

Fi 12 is a detail in plan of an aperture slide for controlling the flow of plastic material into the dies.

operating the slide.

Fig. 15 is a detail in section of a plunger and measuring cup for regulating the quantity of material discharged to the dies.

Fig. 16 isa fragmentary detail in side elevation showing mechanism for positively `gischargixig completed articles from the les.

Fig. 17 is a plan viewof the mechanism shown in Fig. 15.

Fig. 18 is a sectional detail in plan showing'the guide means for controlling the an- Igular setting of the die holders on the rotary die support.

VThe present machine is intended for handling sticky, plastic material when heated, forming such material'into articles of desired shape and cooling and contracting the articles away from the forming dies and dischar 'ng such articles from one set of dies w ile .other sets of dies are being loaded, others going through the forming operation, and still others are supporting :the formed articles during the chilling or hardening operations. The machine as shown in the drawings comprises in general a lsupporting structure having mounted at its upperend a stirring or mixing vat pro- 'vided with suitable measurin and dischargin devices' at the lower end t ereof. At one ,sii 'e of thestirring vat is a plurality o f reto provide improved means for cooling the dies and also improved means for cooling and shrinking the articles formed, by direct application of an air blast while such articles are still su ported `in one of the sets of Acoperatingdies; to provide improved means for guiding-pivotally mounted dies on a rotary drum so that these dies will assume the roper positionv for loading, stamping, coo in'g and delivering operations.; to provide improved means lfor intermittently driving 4the die holder support or drum; and to provide various improvements in constructional features which will hereinafter be explained.

An illustrative embodiment Vof this invention is shown in the accompanyingdrawings, in which- Figure 1 is a side elevation of Aa molding machine constructed in accordance with this invention.

Fig. 2 is a Ifront view of the machine, showlng the die' supporting drum partly-in section.

Fig. 3 is a. transverse vertical section takenon the line A`-A of Fig. 2.

Fig. 4 4is a sectional'detail on one f the pivoted'die holders and shows the const ucton Aof -thedie supported therein andlthe discharging plunger.

Figs. 13 and 14 are details of cams for' Fig. 10 isa plan view of one of the pluniao ciprocating plungers suitably formed to co` operate with convex dies. The latter are mounted in al plurality of oscillating frames which in turn are pivoted to a rotary frame or drum. Suitable means are provided for 'imparting an intermittent motion to said drum, and during thiso eration, the oseillating die holders are gui ed as required for receiving lastic material while the holders are in horizontal position and also properly supporting these dies during the forming operation, when the reciprocating plunger dies are engaged therewith.

Improved means are provided for centering the oscillating dies with respect to the plunger' dies, and provision is made for cireulating a cooling medium such as water around the dies and for projecting streams of air against the formed articles while-still in the dies.

The supporting structure or frame shown in the drawings as journals for thedriven sha s of the machine. leys 3 thereon, also carries fa a pinion 4 meshing with a gear 5 on the opposite side lis ' of the machine from the ulleys 3. A shaft 5 12; Ashaft 13 on which the gears 9 vand '28 and connections to axle 17. Ea

6, which rigidly carries t e gear- 5, also'carriesa-pair of gears 7 and- 8 res ectively meshing with gears 9 and 10, an 11 and 11 are fast, passes through a stirring vat 14 and carries inclined stirring blades 15l located within the vat. The large gears 10 and 12 are respectively secure axles 16 and 17, (Fig. 2) which serveto support a die supporting frame 18 and also to conduct a cooling fluid into and out of the die holders 19 supported on said frame.

The axle sections 16 and 17- arebolted together and to a central supporting disk 20 or the frame or drum 18. ipes 21 andl 22 lead from the hollow portions of the axles 16 and 17 to flexible tubes 23 leading to and from the hollow die holders 19.

The die holders 19 are in theV form of hollow drums as shown in Figs. 7 and 8, having suitable recesses 24 for receivin concave dies 25 shown in dotted lines in. ig. 8 and in full lines in Fig. 4. Central lon itudnal ribs 26, (Fig. 7) extend between t e recesses 24 to compel the water or other cooling fluid to pass around the die holder in contact with the inner surfaces of dies 25 which are exposed therein. The water may be caused to ytravel through the die holders under pressure from a pipe leading into the end of hollow axle 16 and from thence through the pipe 21 through tube 23 inlet 27 of the die holder and around all of the dies therein and out through t outlet of the dies 25 as shown in Fig. 4 is provided with in the inner side of its respective die holder.

rovided with 4the die holders carries at its ends to hollow This sleeve is threaded to receive a nut 31 whereby the die may be firmly clamped to the die holder. The stem 32 of a discharge plun er is slidable within sleeve 29, the head 33` o such .lplunger resting in a recess 34 of the die. he plunger is normally urged into, the position in which it is shown in Fig. 4 by a spring 35 encircling the part 32 of the plunger and compressed between sleeve 29 and a collar 36 on the plunger.

. At the proper time during the rotation of the diesupporting drums 18, the lungers 32 are operated against the actiono springs 35 to eject the finished articles from the dies.

:The means for so operating the plungers is "roller 39 and are thereby cammed downwardly, causing the dogs 37 to engage collars 36 of the plungers and project the same downwardly. The maindriveshaft2 having pul v For the purpose of controlling theoscillationy of the die holders 1 9 around their pivotal connections withdrum 18, each of airs of spaced rollers 40 and 41. These ro 1ers engage iixed tracks 42 and 43 supported on y 44, for the purpose of maintainin 'the die holders in horizontal-position as t ey come to rest beneath the discharge apertures 45 inthe vat 14 and the forming plungers 46 which aremounted for reciprocation in the upper part of frame 1.4 The tracks 43 serve to guide the die holders 19 as they pass from the forming plungers 46 to the point of discharge at the bottom of the machine.

During this part of the travel of the die inthe direction indicated by the arrow 47 in Fig. 3, the articles which are formed of the plastic material and exposed in the dies 25 are subjected to the .cooling action of streams of air from apertures 48 in the nozzle member 49. The air is forced under pressure into the member 49 through the inlet 50 thereof.

Intermittent step-by-step motion is imparted to the drum 18 b means of cams 51 and 52 which may be integral with the gears 10 and 12 and operate on rollers 53 (Fig. 1) on bell crank levers 54 pivoted to the frame 1 by stub shafts 55. The lower arm .of bell crank lever 54 carries a roller 56 which during the rocking motion of the bell crank lever engages the surfaces 57 of dogs' 38 onthe drum 18. When the dogs 38 are engaged by rollers 56, they are prevented from rocking on their-pivots by the stops 58 but may lfreely be rocked in the opposite direction whenzengaged by the ro11ers39 (Fig. 16).

The upper arms of bell crank levers 54 are connected by links 59 to a frame 60 which is llO maepso reciprocated thereb This frame carries a plurality of feed p ungers 61 and is adjustably connected to the upper end of links 59 by threaded rods 62 passing through nuts 63 at the upper ends of the links 59. Rods 62 may be rotated for the purpose of adjnsting frame 60 with respect to the reciprocating links 59 by means of a hand-wheel y 64. This wheelis fast to a shaft 65 carry.y

ing miter ears 66 meshing with gears 67 fast to rodgs 62. The extent of'reciprocation of frame 60 under the action of bell crank levels 54 is constant, but' the adjustment of the frame causes the plunger 61 to project more or less into the measu apertures 68, during the reciprocation o the plungers. The measuring apertures 68 may be formed in the bottom of receptacle 14 as shown in Fig. 15. Between the measuring apertures 68 and the outlet apertures 45 is a slide 69 having apertures 70 which may be caused to register with the apertures 45. The slide 69 is reciprocated for the purpose of causing the apertures 7() and 45 to bell crank levers 1 pivotally mounted on the frame 1 by means'of shafts 72. The upper arms of bell crank levers 71 are provided with rollers 73 projecting into inclined slots 74 in the slide 69. The oscillation of bell crank levers 71 is controlled by cams 75 and 76 (Figs. 13 and 14) rigid on the frame or drum 18.

The forming plungers 46 are constructed as shown in Figs. 10 and 11, being hollow to provide for the circulation of wat'er therethrough. The Water is conducted to the plungers through a feeder pipe 78, (Fig. 3) having llexible pipe connections 77 with each of the plungers. The pipes 77 communicate with pipes 77.1 tapped into the pluner and provided with nozzles 77.2 in the inside of the plungers, suitably located to project streams of water against the bottom inner surfaces 79 thereof. The water is conducted out of the plungers through the outlets 8O into which are tapped bent pipes 81 which deliver the water to troughs 82. By thus delivering the water in exposed streams from the pipes 81, an operator may easily observe whether there is a proper circulation of water through each of the plungers. The plunger dies 46 are mounted for reciprocation in the frame 1` as shown in Fig. 3, the shank 83 of each of the plungers being secured to a cross-head 84 which is suitably guided bv rods 8 5 secured thereto and passing through guides 86 in the frame 1. The cross-head 84 is connected by rods 87 to a cross-head 88, (Figi), which is pivotally supported on arms 89 pivoted at' 90 to the bottom part of the frame 1. The arms 89 carry rollers 91 which coperate with the outer ysurfaces 92 of cams 51 and the inner surfaces 93 of cams 94, preferably ,A

register at the refpxired times by means of integral with ars 10 and 12 as shown in Fig. 9. This ure also shows the hollow shafts 94 upon which the rollers are 'ournaled ass throu h cross-head 88 an are` secure to arms 8 The plunger dies 46 are encircled by spring pressed stripper rings 95 as shown in Fig. 11, which bear against the dies 25 duringA the downward stroke of the plungers and remain in` contact with such dies during the first part of the upward stroke of the lungers, thereby insuring that the articles ormed will not stick to plungers 46. The springs for controlling the action of strippers 95 are indicated by the numeral 96-and rods 97 projecting upwardly from the strippers, guide the same thro h the flange part 98 of the plunger dies. he Shanks 83 of the plungers bear against coiled springs 99 mounted in the cross-head 84 to provide for a resilient mounting of the plunger-s in the 'guides 11 'provided in the lower part of the cross-head. l

The cross-heads 84 are provided with alining devices 101 in the form of prongs 90 for respectively engaging at opposite sides of rollers'41 and 40 on the die holders 19. During the downward movement of crossheads 84, the aliners by engaging rollers 40 and 41 properly center the dles 25 with respect to the plunger di 46.

In the operation of the device, the plastic material is fed into the receiverv 14 in heated condition. The, stirring blades 15 are continuously rotated-in the direction indicated by the arrow in Fig. 3, Vcausing the material to be fed toward the measuring apertures 68. As the drum 18 is intermittently rotated by means of the rollers 56 on the bell crank levers 54 (Fig. 1) engaging dogs 38. 105 the die holders 19 periodically come to rest in horizontal positiony below the discharge apertures 45. While so at rest, further rotationv of the gears 10 and 12 causes the cams thereon to restore the bell crank levers 54 110 to their initial position through the links 59, causn the feed plunger-s 51 to project downwar y and force the proper quantity of plastic material into the measuring cups 68. The slide 69 towardl the latter part of 115 this operation is shifted to cause the apertures 70 therein to register with the discharge outlets 45, thus permitting the plunger 61 to force the material in the measuring apertures 68 into the dies 25. While 120 this operation is taking place, the set of dies 25 which have previously' been loaded are beneath the plungers 46 and these plungers are caused to travel downwardly into engagement with the dies 25 through the 125 springs 99 and by action of the cross-heads 84 under the control of cam surfaces 92 and 93 operating on rollers 91 and which are connected through the rods 87 with crossheads 84. During the intermittent rotation of the drum 18, the dies 25 in which the articles are formed successively come to rest before `the apertures 48 in the nozzle membex'. 49, and the streams of air from said nozzle member serve to chill the exposed surfaces of such articles, while the inner surfaces thereof are being cooled through contact with the dies 25 around which water is continuously circulating. During this part of the travel of the dieholders, the articles formed in the dies 25 are prevented from dropping out by bars 97 which extend over the edges of the dies. When the dies 25 arrive at the bottom of the machine, the articles are free to drop out on a conveyor (not shown in the drawings). To insure the proper discharge ofthe formed articles, the dogs 37 project the plungers 32 downwardly as controlled by the stationary roller so (Fig. 16). 4

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departin from the spirit of this invention as deined y the following claims.

1. A machine of the class described, comprising a supporting structure, a frame journaled in said supporting structure, means for impartin a step-by-step rotary movement to said rame, a plurality of die holders pivotally supported in said rotary frame, dies mounted in said holders, dies movably mounted in said supporting structure, means for simultaneously feeding a plastic material to one of said die holders and reciprocating said last-mentioned set of dies toward and away from another of said die holders, and cams formaintaining said pivoted die holders in horizontal position during both the feeding and forming operations.

2. In a machine of the class described, a support, a frame rotatably mounted on said support, means for rotating said frame, a plurality of die holders pivotally7 mounted on said frame, dies in said holders, guides on said support in position to be engaged by said die holders and suitably formed to cause said die holders to maintain a horizontal position during a portion of the rotation of said frame, and means for feeding a plastic material to the dies in said holders and forming articles therein while saiddie holders are in'horizontal ponaled in said supporting structure, means for imparting a step-b -step rotary moyement in said rame, a p urality of dies pLV- otally supported in said rotary frame, dies movably mounted in said supporting structure, means for-feeding a plastic material to said first-mentioned dies', means for recipro eating said last-mentioned dies toward and away from said first-mentioned dies, and cams for maintaining said pivoted dies in y substantially horizontal position during both 7,0 the feeding and forming operations.

4. A machine of the class described, comprising a supporting structure, a receptaclesuitable for receiving a plastic material l located in the upper part of said structure, dies movably mounted in said supporting structure, a frame journaled in said supportlng structure, means for 'imparting a step-by-step motion to said frame, a plurality of die holders pivotally mounted on 8 said frame, dies in said holders, said receptacle having outlets for feeding plastic material to the dies in said holders, a roller on each of said die holders, and tracks on said supporting structure in position to engage said rollers and thereby control the oscillation of said die holders with respect to the outlets in said receptacle and said plunger dies.

5. In a -machine of the class described, the combination of a die holder having a plurality of dies supported therein, said die holder being formed to provide means for circulating acooling fluid therethrough and in direct contact with the back of the dies, and means for projecting streams of ,air against the exposed forming surfaces of said dies.

6. In a machine of the class described, a l support, a hollow axle journaled in said100 support, a frame secured to said axle, means for rotating said frame and axle, a plural ity of hollow die holders pivotally mounted on said frame, dies in said holders, guides 011 said support in position to be engaged by said die holders and suitably formed to cause said die holders to maintain a horizontal position during a portion of the rotation of said frame, flexible connections between said hollow die holders and hollow axle `whereby a cooling fluid may be conducted to and .from said hollow axle and circulated through the die holders during oscillation thereof.

ggned at Chicago this 9th day of Oct. 115

CESARE BARBIERI. 

